To assemble, take a potato, cut a sliver off the bottom so it will sit comfortably, and another sliver off the top. Spread or brush a small amount of dressing on top cut side. Take a thin slice of salmon, cut in half, twirl into a small roll and set atop potato. Drizzle a little dressing over and garnish with more chives. Repeat for each potato. Set on a serving platter.